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Performance of Integrated Hydronic Heating Systems Project Report Performance of Integrated Hydronic Heating Systems Project Report December 2007 Thomas A. Butcher Prepared for the New York State Energy Research and Development Authority and National Oilheat Research Alliance Energy Resources Division Department of Energy Sciences and Technology Brookhaven National Laboratory Brookhaven Science Associates Upton, NY 11973-5000 Under Contract No. DE-ACO2-98CH10886 with the United States Department of Energy DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency, contractor or subcontractor thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency, contractor, or subcontractor thereof. Acknowledgements: The author would like to acknowledge the project sponsors: New York State Energy Research and Development Authority and the National Oilheat Research Alliance. In addition many manufacturers donated equipment for this work and participated in project reviews. Yusuf Celebi and George Wei provided a great deal of support in lab setup and operations. Roger McDonald provided many helpful comments and suggestions based on a great deal of prior, related work. I would also like to acknowledge Mr. John D. Marran of the Energy Kinetics company who will long be remembered as a strong supporter of advancing system energy efficiency. Abstract A variety of system configurations are used in North America to meet the heating and domestic hot water needs of single-family homes. This includes, for example: warm air furnaces with electric water heaters; boilers with integrated hot water coils; and boilers with “indirect” hot water storage tanks. Integrated hydronic systems which provide both heat and hot water are more popular only in the Northeast and mid-Atlantic regions. For those making decisions about configurations of these integrated hydronic systems, including control options, little information is available concerning the annual energy cost implications of these decisions. This report presents results of a project to use a direct load emulation approach to measure the performance of hydronic systems, develop performance curves, and to provide decision tools to consumers. This is a laboratory measurement system involving direct energy input and output measurements under different load patterns. These results are then used to develop performance correlations for specific systems that can be used to predict energy use in specific applications. A wide range of system types have been tested under this project including conventional boilers with “tankless” internal coils for domestic hot water production, boilers with indirect external storage tanks, tank type water heaters which may also be used for space heating, condensing oil- and gas-fired systems, and systems with custom control features. It is shown that low load and idle energy losses can have a very large impact on the total annual energy use and that the potential energy savings associated with replacing old equipment with newer, high efficiency equipment with low losses at idle or low load can be in the 25% range. These savings are larger than simple combustion efficiency measurements would indicate. i Table of Contents Abstract ...................................................................................................................................................... i List of Figures ..........................................................................................................................................iii List of Tables............................................................................................................................................iii Introduction ............................................................................................................................................... 1 Experimental ............................................................................................................................................. 2 Systems Tested.......................................................................................................................................... 4 Experimental Results................................................................................................................................. 5 Analysis of Results.................................................................................................................................... 7 Conclusions ............................................................................................................................................. 10 Recommendations ................................................................................................................................... 11 References ............................................................................................................................................... 11 Appendices 1-12 – Test Results for all Units ii List of Figures Figure 1 Illustration of the basic test setup................................................................................................ 3 Figure 2. Example of a typical hourly distribution of domestic hot water load which can be used during system performance testing............................................................................................................... 4 Figure 3 Impact of draft level on measured idle loss ................................................................................ 6 Figure 4. Illustration of the results of tests with Unit 1............................................................................ 6 Figure 5 Illustration of interface screen on program developed to apply test results to simple bin analysis of fuel use ............................................................................................................................ 8 List of Tables 1 List of Systems Evaluated Under this Project.................................................................................5 2 Summary of All Basic Test Results ................................................................................................7 3 Results of Analysis of Annual Performance with Each Unit ..........................................................9 4 Comp. of Annual Energy Savings Associated with Replacing System 10 with Other Systems...10 iii Introduction Across the U.S. the dominant heating system in single family homes is a warm air furnace which integrates easily with central air conditioning. In the Northeast and some other colder regions, hydronic heating systems are more popular. For these systems there are a wide range of configurations used for producing domestic hot water including, for example, use of a domestic water coil inserted in the heating boiler (low cost, traditional system); use of an indirect domestic hot water tank heated from the heating boiler; and use of a separate, fuel or electric fired hot water heater. There are also an increasing range of control configuration options available including outdoor reset, cold start, thermal purge, and variable setpoint differential. The main measure that is used for identifying the efficiency of heating systems in the U.S. is termed the Annual Fuel Utilization Efficiency (AFUE). A standard for this measure for boilers is maintained by the American Society of Heating Refrigeration and Air Conditioning Engineers (Standard 103 - ASHRAE) [1] and this is adapted for a federal labeling procedure by the U.S. Department of Energy. The AFUE measure is based upon a heat loss method and involves measurement of excess air and flue gas temperature over operating cycles considered typical of national average conditions. This method considers heating load only, not domestic hot water. Annual efficiency is based on an assumption of a typical national oversize factor for the heating load of 1.7. In the case of a boiler the prescribed conditions are: supply temperature 140 F, return temperature 120 F, burner average on-time (9.68 minutes), burner average off-time (33.26 minutes). Energy loss during the off cycle is accounted for through the rate of cooling of flue gas following the burner shutdown and the mass flow of flue gas during the off cycle (estimated or measured). The ASHRAE procedure provides a method for measuring “jacket” energy losses for a boiler while firing in steady state and then calculating the annual cost of these losses based upon a location factor. The test involves measurement of the surface temperatures on the boiler jacket and then calculation of the convective and radiative heat loss. In lieu of a measurement a 1% default value for steady state jacket loss can be assumed. In the formal labeling procedure it is assumed that all boilers are located within the
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